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<div class="title">The OWL API</div>


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<p>
<a href="https://sourceforge.net/projects/owlapi/files/">Download the latest release</a>.
<p>
The <span class="highlight">OWL API</span> is a <span class="highlight">Java</span> API and reference implmentation for creating, manipulating and serialising <span class="highlight">OWL Ontologies</span>. The latest version of the API is focused towards <span class="highlight"><a href="http://www.w3.org/2007/OWL/">OWL 2</a></span></p>
<p>
The OWL API is <span class="highlight">open source</span> and is available under either the <span class="highlight">LGPL</span> or <span class="highlight">Apache</span> Licenses</p>
<p>The OWL API includes the following components:</p>


<ul>
<li>An API for OWL 2 and an efficient in-memory reference implementation</li>
<li><span class="highlight">RDF/XML</span> parser and writer</li>
<li><span class="highlight">OWL/XML parser</span> and writer</li>
<li><span class="highlight">OWL Functional Syntax</span> parser and writer</li>
<li><span class="highlight">Turtle</span> parser and writer </li>
<li><span class="highlight">KRSS</span> parser</li>
<li><span class="highlight">OBO Flat file format </span>parser</li>
<li>Reasoner interfaces for working with reasoners such as FaCT++, HermiT, Pellet and Racer</li> 
</ul>
<p>
The original version of the API for OWL 1.0 was developed as part of the <a href="http://wonderweb.semanticweb.org">WonderWeb Project</a>.  Version 2.0.0 of the OWL API for was  developed as part of the <a href="http://www.co-ode.org">CO-ODE</a> project and the <a href="http://www.tonesproject.org">TONES</a> project.  Version 3.0.0 is developed primarily at the University of Manchester.</p>

<h1>Contributors</h1>

The OWL API is primarily maintained at the University of Manchester, but there have been significant contributions from various groups and companies:

<ul>
	<li><a href="http://clarkparsia.com/">Clark &amp; Parsia LLC</a> (Explanation code, Modularity code)</li> 
	<li><a href="http://www.informatik.uni-ulm.de/ki/noppens.html">University of Ulm</a> (KRSS2 syntax parser and renderer)</li> 
</ul>

<h1>Acknowledgements</h1>
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OWL API development is supported by various free open source licenses:
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<strong>YourKit Profiler</strong>
<p>
YourKit is kindly supporting open source projects with its full-featured Java Profiler.
YourKit, LLC is the creator of innovative and intelligent tools for profiling
Java and .NET applications. Take a look at YourKit's leading software products:
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<a href="http://www.yourkit.com/.net/profiler/index.jsp">YourKit .NET Profiler</a>.
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<strong>IntelliJ</strong>
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Note that the web pages for version 2 of the OWL API may be found <a href="2.x.x.zip">here</a>.
Version 3.0.0 pages are available <a href="3.0.0.zip">here</a>.
</p>
<p>Both are here for reference; those versions of the API are not recommended for new starters.</p>
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